I recently bought two gold algae eaters. one of them is doing great and seems to be growing, but the other seems to be getting skinnier and now he has dark patches, like bruises all over. I'm thingking that whatever the scientists do to that breed to make them that color sometimes wears off, but I'm still worried about his skininess. The other algae eater chases him sometimes, so I put a divider in the tank to separate them. Any suggestions as to what is wrong?